Why I cant create an object without the new keyword? - Dart 2 · Issue #32941 · dart-lang/sdk · GitHub
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![flutter - I am getting error: Undefined class 'required'. when trying to use required keyword - Stack Overflow flutter - I am getting error: Undefined class 'required'. when trying to use required keyword - Stack Overflow](https://i.stack.imgur.com/bhDwd.png)